Tidworth Transformer Change

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The existing 5MVA, 33/6.6kV transformers at Tidworth are reaching life expiry and are due for replacement. The transformers have no automatic voltage control facilities and currently supply an estimated demand of 3MVA.

The 33kV connection to the transformers is onto bushings via droppers from overhead lines routed from Ratfyn. The 6.6kV connections to the Tidworth 6.6kV switchboard are underground cables connected in cable boxes at both the transformer and the 6.6kV switchgear.

The following work is proposed:

Transformers

To install new transformers with an ONAN rating of 7.5MVA and ONAF rating of 10MVA and with fully automated tap changing facilities/voltage control. The transformers will be dual ratio 33/11/6.6kV to enable the future upgrade of the Tidworth network to 11kV operating voltage. The firm transformer capacity of 7.5kVA will provide for any increase in demand at Tidworth arising from the on-going re-development of the Camp facilities.

Transformer Bunding

The existing transformer plinths are not bunded to restrain any leakage of oil from the transformer tank. In association with the transformer replacement it is proposed that bunding is provided. If possible the existing plinths will be retained and bunding works will be undertaken. If the footprint of the new transformers does not fit with the existing plinth design then the existing plinths will be removed and new bunded design plinths installed.

Long O Donnell Associates was awarded the EDF Energy CDM Coordination services framework contract for a period of up to 5 years commencing in October 2008.

The contract required Project Services to include CDM Coordination on EDF HV networks including infrastructure, rail and airport projects.  

Client

EDF Energy

Project Value

£1M

Project Duration

2008 - 2013

Services Provided

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Tidworth Transformer Change,

The existing 5MVA, 33/6.6kV transformers at Tidworth are reaching life expiry and are due for replacement. The transformers have no automatic voltage control facilities and currently supply an estimated…